Method and program for identifying errors

Abstract

A method for identifying geometric errors with respect to at least two translational axes and at least one rotational axis of a machine using a control device is disclosed. The method comprises the steps of: measuring positions of a jig in three-dimensional space using a position measurement sensor, wherein a measurement is carried out when the jig being indexed around the rotational axis by a plurality of angles is located at the positions; approximating a plurality of measured values of the positions measured in the measuring step to a circular arc; and calculating an error in regard to a center position of the rotational axis and / or a tilt error in the rotational axis, and tilt errors in the translational axes, based on the circular arc resulting from the approximating step.

Description

This application claims the entire benefit of Japanese Patent Application Number 2009-186735 filed on Aug. 11, 2009, the entirety of which is incorporated by reference.BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to a method and a program for identifying geometric errors of a machine having translational and rotational drive axes.2. Description of Related ArtAs an example of a machine having translational and rotational drive axes, there is known a machine tool for processing parts or metal molds. Such a machine tool can process a workpiece into a desired shape by a material removal process including relative movements of both or either of a tool and a workpiece while rotating the tool or the workpiece.As an example of this machine tool, FIG. 1 shows a schematic view of a three-axis control machining center (three-axis machine) having three translational axes. A spindle head 2 is allowed to make a translational movement with 2 degrees of freedom ...

Images